Influence of the form of radiating aperture on wave processes in the near field omnidirectional aperture antennas

Abstract

The amplitude and phase characteristics of the electric and magnetic fields in the near zone of the aperture antennas small electrical sizes are theoretically investigated. It is shown that the fields of such antennas decrease uniformly, without the formation of the searchlight beam. The searchlight beam is forming by aperture antenna with aperture of the square or round shape that bigger than one or two wavelength.